EXPERIMENTAL INVESTIGATION OF 2kW HIGH PRESSURE GASIFIER

摘要

In a gasifier, the main attractive factors are the design and the operation. An optimized gasification process produces a considerably clean gas without additional energy. So a double walled gasifier combining the features of a closed top and an open top gasifier was developed and the performance behavior was investigated at different operating pressures. The gasifier has a total height of 1500mm, made of stainless steel with internal diameter of 196mm and thickness of 4.2mm. A conical section of height 300mm is provided at the bottom of the gasifier. The gasifier was tested using wood chips of size approximately 12.5mm x 12.5mm x 12.5mm. A total feed of 7-8 kg of wood was fed into the system and an airflow rate of 110 lpm was supplied by a compressor and the gasifier was tested at different operating pressures. The main variables namely oxidation zone temperature, combustible contents ( H2 ,CO & CH4), calorific value, gas production rate and cold gas efficiency was studied .The percentage of total combustible components (H2, CO, CH4) was found to vary between 21.46% - 34.6% and their average composition was H2 =20.36% - 23.782%, CO = 9.658% 11.82%, CH4 =0.872% 1.432 %, N2 = 47.42% 52.36%, CO2 = 12.086%-18.154%. The calorific value of the gas was found to vary between 3.975 MJ/m3 - 4.532 MJ/m3 while the cold gas efficiency varied between 68.39% - 91.389%